Mechanism of the sulfurisation of phosphines and phosphites using 3-amino-1,2,4-dithiazole-5-thione (xanthane hydride)
作者:Jiří Hanusek、Mark A. Russell、Andrew P. Laws、Petr Jansa、John H. Atherton、Kevin Fettes、Michael I. Page
DOI:10.1039/b616298c
日期:——
report, the sulfurisation of phosphorus(III) derivatives by 3-amino-1,2,4-dithiazole-5-thione (xanthane hydride) does not yield carbon disulfide and cyanamide as the additional reaction products. The reaction of xanthane hydride with triphenyl phosphine or trimethyl phosphite yields triphenyl phosphine sulfide or trimethyl thiophosphate, respectively, and thiocarbamoyl isothiocyanate which has been trapped
1,2,4-Dithiazole-5-ones and 5-thiones as efficient sulfurizing agents of phosphorus(iii) compounds – a kinetic comparative study
作者:Oleksandr Ponomarov、Andrew P. Laws、Jiří Hanusek
DOI:10.1039/c2ob26460a
日期:——
The existence of the phosphonium intermediate during sulfurization of triphenyl phosphine with 3-phenyl-1,2,4-dithiazole-5-thione (7a) was proven using kineticstudies. From the Hammett and Brønsted correlations and from other kinetic measurements it was concluded that the transition-state structure is almost apolar for the most reactive 1,2,4-dithiazoles whereas a polar structure resembling a zwitter-ionic
The invention relates to the use of 1,2,4-dithiazolium salts, some of which are known, of the general formula (I) ##STR1## in which the substituents have the meaning given in the description, to a process for their preparation and to their use as chemotherapeutics, in particular as TNF inhibitors.